Issues with requests sent to the rest scopes server

[Facundo Batista]

See for example the log line here:

  https://pastebin.canonical.com/118745/

I'm sure it's from a recent phone image because it has the software
versions inside.

This is what I see strange, though:

- The country parameter is broken: "...&country=scopes-api=0.6.6+..."

- I thought the scopes-api, plugin, release, etc, should be inside an
"user agent" parameter, not all different separated parameters in the
request... it's harder to use them if they're separated, and they will
even change in the future (today we have a "unity8" parameter, that at
some point will be "unity9", etc..)

Thanks!